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Authority

(Throndsen) B.Leadb. (Leadbeater, 1978: 514)

Class

Craspedophyceae/Choanoflagellida

Order

Choanoflagellida

Family

Acanthoecidae

Additional References

Manton et al. (1980: 438, pl. 3, 4), Thomsen et al. (1990: 368, figs 2–4), Thomsen & Larsen (1992: 55, figs 7–11)

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Basionym

Salpingoeca spinifera Throndsen (1970b: 88)

Synonyms

N/A

Description

Cells solitary. Lorica slender, Y-shaped, (17–) 55 (–116) µm long, with 7 costal strips. Longitudinal costae 2, characteristically crossed-over in the anterior area of the protoplast, extending anteriorly to form 2 anterior spines and posteriorly to form a pedicel comprising 4 costal strips. Transverse costae absent. Protoplast ellipsoidal, 5-9 µm long.

Distribution

Abundant in Antarctic waters at temperatures below 10°C (Manton et al., 1980; Buck, 1981; Thomsen & Larsen, 1990).

Comments

Some specimens have longitudinal costae that are obliquely arranged at their junction with the posterior spine thus complicating the separation of B. spinifera, B. antennigera and B. minor. See the discussion under Bicosta antennigera as well as Thomsen et al. (1990) and Hara & Takahashi (1987) for further discussion of B. minor.

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